57 Nothing is hidden. Light also exposes, and Jesus was suggesting that his teaching likewise revealed where people are and where they will be. Truth will be manifest in the future, just as it was declared by him then. Nothing will be concealed.
58 Or “disclosed.”

In other versions

For nothing is hidden that will not be made manifest, nor is anything secret that will not be known and come to light.

For there is nothing hidden that will not be disclosed, and nothing concealed that will not be known or brought out into the open.

For nothing is concealed that won’t be revealed, and nothing hidden that won’t be made known and brought to light.

For all that is secret will eventually be brought into the open, and everything that is concealed will be brought to light and made known to all.

For nothing is secret that will not become evident, and nothing hidden that will never be known and come to light.

For nothing is secret, that shall not be made manifest; neither any thing hid, that shall not be known and come abroad.

Public Domain